Internal line hydraulic fluid pressure transmission recalibration unit

Abstract

An electronic device for modifying the calibration of the electronic control system of a modern electronic transmission. An analog processor monitors an electrical current indicating the internal line hydraulic fluid pressure of the transmission and the throttle output of an engine associated with the transmission to detect deficiencies in the internal line hydraulic fluid pressure of the transmission. Further, upon the detection of deficiencies in the internal line hydraulic fluid pressure, the analog processor alters the electronic feedback between the electronic control system and an electronic pressure valve responsible for regulating the internal line hydraulic fluid pressure to increase the internal line hydraulic fluid pressure.

What is claimed is: 
     
       1. A method for recalibrating internal hydraulic fluid pressure of an electronically controlled transmission comprising the steps of: (a) monitoring a control signal transmitted by an electronic control system to an electronic pressure valve;   (b) monitoring an engine load control signal;   (c) generating a first electronic signal proportional to said control signal;   (d) generating a second electronic signal proportional to said engine load control signal;   (e) multiplying said first electronic signal by said second electronic signal to obtain a product;   (f) generating an injection signal proportional to said product when said first and second electronic signals both have positive values; and   (g) injecting said injection signal into a feedback signal transmitted from said electronic pressure valve to said electronic control system.   
     
     
       2. The method of claim 1 wherein said engine load control signal has a predetermined maximum value, and said second electronic signal has a positive value when said engine load control signal exceeds a predetermined percentage of said predetermined maximum value. 
     
     
       3. The method of claim 1 wherein said engine load control signal is an output signal generated by a throttle position sensor. 
     
     
       4. A recalibration device for recalibrating internal hydraulic fluid pressure of an electronically controlled transmission, said recalibration device comprising a signal processor having at least one input comprising a voltage generated by passing a current generated by an electronic pressure valve output of an electronic control system through a current sensing resistor and an output, said at least one input connected to an electronic pressure valve output of an electronic control system, said output connected to a feedback line from said electronic pressure valve to said electronic control system, said signal processor generating and injecting an injection signal into said feedback line responsive to at least said at least one input. 
     
     
       5. The recalibration device of claim 4 wherein said signal processor further comprises a second input, said second input connected to an output of an engine load sensor, said signal processor generating and injecting said injection signal into said feedback line responsive to at least said at least one input and said second inputs. 
     
     
       6. The recalibration device of claim 5 wherein said engine load sensor is a throttle position sensor generating an output voltage proportional to throttle position. 
     
     
       7. The recalibration device of claim 5 wherein said signal processor comprises a first quadrant multiplier and an output driver circuit, said first quadrant multiplier connected to said at least one input and said second inputs, said output driver circuit connected to and controlled by said first quadrant multiplier, said output driver circuit connected to said signal processor output. 
     
     
       8. A recalibration device for recalibrating internal hydraulic fluid pressure of an electronically controlled transmission, said recalibration device comprising a signal processor having a first and second inputs and an output, said first input connected to an electronic pressure valve output of an electronic control system, said second input comprising a voltage differential between an output voltage of an engine load sensor and a predetermined reference voltage, said output connected to a feedback line from said electronic pressure valve to said electronic control system, said signal processor generating and injecting an injection signal into said feedback line responsive to at least said first and second inputs. 
     
     
       9. A recalibration device for recalibrating internal hydraulic fluid pressure of an electronically controlled transmission, said recalibration device comprising: a signal processor having at least one input and an output, said at least one input connected to an electronic pressure valve output of an electronic control system, said output connected to a feedback line from an electronic pressure valve to said electronic control system, said signal processor generating and injecting an injection signal into said feedback line responsive to at least said at least one input; and   a power supply electrically connected to said signal processor, and electrically connected to an external supply voltage, said power supply capable of delivering a voltage in excess of said external supply voltage to said signal processor for injecting said injection signal into said feedback line from said electronic pressure valve.